岁寒知松柏；患难见交情：

When you are young, you know pines and cypresses； when you are in trouble, you see friendship.

二人同心，其利断金：

The two of them are united, and their profits are cut off.

朋友千人尚觉少，仇敌一人犹嫌多：

A thousand friends are few, but one enemy is too many.

脚长沾露水，嘴长惹是非：

The feet are dewy and the mouth is long.

得朋友难，失朋友易：

A friend is easier lost than found.

患难见真情：

A friend in need is a friend indeed.

需要之时方知友：

A friend is never known till a man has need.

朋友没有缺点：

A friend without faults will never be found.

士为知己者用，女为悦己者容：

A gentleman acts on behalf of an understanding friend, as a woman makes herself beautiful for her lover.

兄弟不一定是朋友，而朋友一定是兄弟：

A brother may not be a friend, but a friend will always be a brother.

友谊是两者思想的结合：

Friendship is almost always the union of a part of one mind with a part of another； people are friends in spots.

与良友为伴，路遥不觉远：

No road is long with good company.

精诚所至，金石为开：

Faith will move mountain.

与恶友交不如独处：

It is better to be alone than in bad company.

小鸟需要美丽的羽毛衬托：

Fine feathers make fine birds.

铜臭味浓往往是友谊的不祥之兆：

The smell of coin is often the knell of friendship.

对朋友爱得越深，奉承得就越少：

The more we love our friends, the less we flatter them.

君子之交淡如水：

The friendship of a gentleman is insipid as water.

背后说好话，才是真朋友：

He is a good friend that speaks well of us behind our backs.

朋友是什么？两幅躯壳拥有同一个灵魂：

What is a friend？ A single soul dwelling in two bodies.

友谊像一株生长缓慢的植物：

Friendship is like a plant of slow growth.

滥交者没有朋友：

A friend to all is a friend to none.

益友难得：

A faithful friend is hard to find.

人生在世无朋友，犹如生活无太阳：

A life without a friend is a life without a sun.

选择朋友要审慎，摒弃更要审又慎：

Be slow in choosing a friend； slower in changing.

患难见真交：

A friend in need is a friend indeed.

父亲是宝藏，兄弟是兄弟：

A father is a treasure, a brother is a brother.

这些谚语涵盖了友谊的多个方面，从选择朋友到维护友谊，从朋友的价值到友谊的脆弱性。希望这些谚语能帮助你更好地理解和表达与朋友之间的关系。